RDL RM-MP12A Audio Monitor Panel - 12 Line or Speaker InputsEach RM MP12 input may be individually calibrated for unbalanced consumer, balanced professional, 8 Ohm speaker line or constant voltage speaker lines. There is a variable intensity LED on the front panel to show audio presence for each input. If the RM MP12 is set to the interlocking operating mode, front panel pushbuttons select one of the twelve inputs to feed the calibrated meter, front panel speaker (or external speaker if connected) and